smoking dad

My dad smokes a lot, and as it is very unhealthy I want to make him quit but I'm afraid he'll get angry if I'll openly try to make him quit
So my question is, are there ways to make someone quit smoking without that person finding out?
Thanks already for taking the effort of reading my thread

I don't think there is, sorry. I tell my mom all the time to stop and remind her how bad it is for health, but it is very addicting. You just have to hope that one day they'll stop on their own, because they won't stop unless they want to.